diff --git a/graph/counting_c4/hash.json b/graph/counting_c4/hash.json
index 72c852ac..12b9c13a 100644
--- a/graph/counting_c4/hash.json
+++ b/graph/counting_c4/hash.json
@@ -13,12 +13,12 @@
   "example_00.out": "4d63f406a3bcef559f00b5f813653f1af9df3aa68b74a7ffeb807a6aac50e4b5",
   "example_01.in": "bfa92308133a7d4e3243715928f76308b2558be73b2b04003c48b55984e843e8",
   "example_01.out": "dba632e9f3ed534062fc9cb1baa9359e6793be03ee7763ec77144b3f829f6d50",
-  "large_random_simple_00.in": "44cb27620d64b62f047ba8f8a423dbed80acfa23cd59e93cf54224cbf9b61723",
-  "large_random_simple_00.out": "d36652df2526a4c7138dfee0c223cf920ef62ca7e15ada504c47f55f6d7b2ad1",
-  "large_random_simple_01.in": "9e64f63c2dbfb9f690672c05526a430ef84f916176e9a623c5abf1449078487a",
-  "large_random_simple_01.out": "548a36dea177236cf83a5f64891953e0a2e3ff1e9d86c3accab157d5a2fcc1f3",
-  "large_random_simple_02.in": "d26fa7116f774d95d2e7d99369cc7b3f0a5cfacee7199b305e186233846fc191",
-  "large_random_simple_02.out": "238d4004061ef66946c03f90ad41b4843df66341ed8d7db5b45863a1954865a4",
+  "large_random_simple_00.in": "14b5d1a028977df03661e2520c683cc2037ce61fd6268fad52400fce2cc14da0",
+  "large_random_simple_00.out": "70136d4393178036e3758ed994292ba81c24954f731ec06545645e5adcdf0063",
+  "large_random_simple_01.in": "faced67b3643dd0254c6b4556b2098f18d0eeec145a9f3dc6b645ff8ccf5cd93",
+  "large_random_simple_01.out": "51f88c18bae2d1c7c2c0aa9dee11d4d8deb31aac6dd64aa7c1bbb5ab14c13900",
+  "large_random_simple_02.in": "86e4fd47363100ef342e583f8a7e61a199cf804223e175e95802b44ddcf57aee",
+  "large_random_simple_02.out": "3e2062a317a352cc85454945b084a8d5932c1880815a8eb64f712cab519a62b8",
   "max_complete_00.in": "faa8f55ece1e03c5bbf84c0dd3ffb666311da65bff1fabe845efdf87c41f8f67",
   "max_complete_00.out": "7d7afb1647bbf969f458cffc99ef56ce01371df76c18427a655ccfbb925d35d9",
   "max_near_k_simple_00.in": "5a30f2b4749da5b232f4935c48da94313fda3eb98d14c0bfc1ca5eba50bb6c30",
@@ -41,18 +41,18 @@
   "multiplied_c4_00.out": "fb609cbf127b3b57d5a37db729a4c06fb739fd38314aada9930fd4837ae11205",
   "multiplied_c4_01.in": "d89740ef8722439394989088d2eb56153cb27878fef7b5bf0baa57b33b63e3f1",
   "multiplied_c4_01.out": "76c1472c0ebe10d2692d74ec0eb829026c630f33f7a610ab5c886e55c34a1a87",
-  "small_dense_simple_00.in": "4026e5c3c70e13a13fcb6822fa1ea5740a522036b6330f530823fcebed6a785b",
-  "small_dense_simple_00.out": "bf5de309d2f5082675cb5cc72cca04dc11ec0b64dc59e7cff4749ffd49acec23",
-  "small_dense_simple_01.in": "e2c872ad4f3be89102459c3a723591906c20e61e90b2717df2342cd6899b7b34",
-  "small_dense_simple_01.out": "f4fa3e67247b138fb01ef342d0ba569c5a8933845f08934380e7e1d1ba2cc4eb",
-  "small_dense_simple_02.in": "7327e34632e7fc581c6b8cbe102c2e3f9724ea8e538587707122df6f53a22f62",
-  "small_dense_simple_02.out": "f4f5b0750d196dc875594cd91cd2f1fc21f2acf2487ce8aac024f8631bc7037c",
-  "small_sparse_simple_00.in": "2ac3dae959ad57452a968dd7cc52b15c27e61e74c74b9de77c09dab157e14006",
-  "small_sparse_simple_00.out": "3c9752241fd367167acb485d31e21ae10c16f45ea5afda3a139761aac6456fbd",
-  "small_sparse_simple_01.in": "b9bf6eaf04589a863ddeb01bad2476201d2f65d24a97119124d6f3cb2334601d",
-  "small_sparse_simple_01.out": "72bfe168435d32a0ecc4a907c1eb5aaf92eba8ad63f5087c0fb5a40dab0467ba",
-  "small_sparse_simple_02.in": "5a01175d6c3f45d92f67acf75619e19d779251229b85dda1981f74d6f9b33935",
-  "small_sparse_simple_02.out": "afde75fab8c06d89460032f59a7d28d8684d93d8006d2e120727c1e7c075c9ad",
+  "small_dense_simple_00.in": "e049cbd4560b5794bed7ed257b7c570e37fc936e8c9d90553d2792b5063ca8ad",
+  "small_dense_simple_00.out": "65c33e5a8e23ad3ae3e9eedcad670361503601de3a43b846b1811e0e24e52ced",
+  "small_dense_simple_01.in": "234a9d7a84baa31ed908778a29b3ead196bd52881ccccd588565b7e680ea12b3",
+  "small_dense_simple_01.out": "b668cc0d1b8251a9d772668a939a446d56f4b1d94a7035d774d87eec42f9d38f",
+  "small_dense_simple_02.in": "ed9240ab3d7d86404e7204e5ff9cc2588cf37a9d88956f7f95957cb67745651c",
+  "small_dense_simple_02.out": "a99bffd672da98017ed2415b821da94aba4f22dc0252780cd55c0d4fce7aece4",
+  "small_sparse_simple_00.in": "bc90cd416ca69b7f3357b0b2180ddb546eb42f1ed32afd85c6fb6ba0fafbac22",
+  "small_sparse_simple_00.out": "b5589774c732a33c2415ba1c9020f43e7acb9696c5dd40846bb204a97895a553",
+  "small_sparse_simple_01.in": "a7d64c2ed5f3ee6b7572b2a7d68f30335ef493950fc97adae2f18913d95172b5",
+  "small_sparse_simple_01.out": "0017d9f8d3bdf9e95de189cfffe3e1040b8207ef8264632eaa25c68a83da0192",
+  "small_sparse_simple_02.in": "4ebc3a3c2af8505fa07beab03f0ae081ad9df9bfcc715f171422fbda60a2ea80",
+  "small_sparse_simple_02.out": "fd9c3768851f7f1c300836f563d41cafc56909cd8d7fbe65e04e7f85c457a1cc",
   "star_00.in": "789d728a7dc148dcac46e927ead606f1d3aeb1f5930bca3cbf428f1adf56742f",
   "star_00.out": "3f213530dc3b6d43b2cee656c9e8f61037a3872c4c6b93781b91f30837f15cb1",
   "star_01.in": "14ab39e690b81115380a89f1e93e1d15275b3dd850b196cdc86a173c6175f9da",
diff --git a/graph/counting_c4/info.toml b/graph/counting_c4/info.toml
index f967c0ac..8fef6ffa 100644
--- a/graph/counting_c4/info.toml
+++ b/graph/counting_c4/info.toml
@@ -41,7 +41,7 @@ forum = "https://github.com/yosupo06/library-checker-problems/issues/973"
     expect = "TLE"
 
 [params]
-	N_MIN = 1
+	N_MIN = 2
 	N_MAX = 300000
 	M_MIN = 1
 	M_MAX = 300000
diff --git a/graph/counting_c4/task.md b/graph/counting_c4/task.md
index e8a40eab..cd3005f6 100644
--- a/graph/counting_c4/task.md
+++ b/graph/counting_c4/task.md
@@ -35,7 +35,7 @@ $u _ {M-1}$ $v _ {M-1}$
 ## @{keyword.output}
 
 ```
-$A _ 0$ $A _ 1$ $\cdots$ $A _ {N-1}$
+$A _ 0$ $A _ 1$ $\cdots$ $A _ {M-1}$
 ```
 
 ## @{keyword.sample}